The 2x16 LCD display can display system status, error messages or your own text. This display connects to the I2C buss and does not need to use any additional i/o pins
The Due has an additional pin for a hardware LCD reset, which can be disabled if you need the pin for another application.
BOT-LOGIC Software is Open Source and supported on the botdeveloper.com website. Once you register with botdeveloper.com, you will have access to a growing comunity of like-minded robot developers, as well as a modified version of the LCD lib which makes it very easy to use the LCD display.